Structural Lightweight Concrete is a type of concrete made from low density aggregate, typically with a density of 1440-1840 kg/m3, compared to normal weight concrete which has a density of approximately 2240- 2400kg/m3. The 28-day compressive strength must be greater than 17 MPa. These values ​​are obtained using light coarse aggregates and normal weight fine aggregates, generally including shales, clays, slates, expanded slag and pyroprocessed expanded fly ash. (NRMCA, 2003) The main use and advantage of structural lightweight concrete is to decrease the weight in a concrete structure, and this allows you to reduce the size of the structural elements and the volume of the concrete, as well as decreasing the amount of reinforcing steel required. The superior strength-to-weight ratio that results from these factors overcomes the fact that lightweight concrete is slightly more expensive and still produces a more economical product. (NRMCA, 2003) Lightweight concrete plays an important role in the construction of large-scale structures around the world, typically in bridges and skyscrapers. With an ever-improving industry and product, lightweight concrete will continue to have a vast impact in the future.HistoryThe use of lightweight concrete can date back to before the time of the Roman Empire, although they were very simple materials and overall quite weak. very durable, and some extant examples can still be found in early Mediterranean-era structures. (Expanded Shale Clay and Slate Institute, 2010) The Roman Empire then implemented the use of lightweight concrete whenever the local supply of materials allowed, as their rapid expansion led to the need for many stronger…half of paper ......not only is weight an important aspect of concrete, but fire resistance is a vital component of any building and therefore of concrete. The fire resistance qualities of LWC are superior to those of regular concrete due to its significantly lower heat transmission. LWC can also be considered very durable and with excellent moisture resistance even after daily wetting cycles for 30 years. Moisture resistance helps prevent steel and other reinforcing components from resisting natural saltwater corrosion. The benefits of this concrete are not only for workers, but also help architects and engineers open up a wider range of applications. Examples of new advances due to LWC include; tall building frames, long-span roofs and bridge structures and thin-shell constructions (hyperbolic parabolic roof structure, sculptures and special design effects).